reads for the UI: TotalCoins, Lives, IsRunOver, CurrentLevel,
LevelOf/IsOwned/CanAfford, HasCleared. The read half of candidate 01 -
callers get a narrow surface instead of reaching into state.
new domain events LivesChanged / TotalCoinsChanged / SkillSetChanged,
announced by comparing against the last announced value, so an operation
can neither forget to announce nor announce something unchanged.
HandlePlayerDeath now clears the spent attempt - it was still counting
towards TotalCoins after its ledger had been discarded.
republisher and EventBus extended; SkillSetChanged is what SkillManager
will reconcile against instead of the non-atomic call pairs. 65 tests.
ProgressionService holds the loaded Profile, active Playthrough and
active Attempt, so "exactly one active Attempt" has a testable home.
EnterLevel always announces LevelStarted - the reason ghost recording
and splits never worked on level 1 or after a Continue. Refuses
unreachable levels. Does not touch campaign position, so a Replay
leaves it alone.
SkillCatalogue returns null for a skill with no authored upgrades,
killing the Upgrades[0].Cost overrun. PurchaseSkill reads the current
level from the ledger first, so one Attempt can unlock then upgrade.
HandlePlayerDeath now persists - death was free if you quit.
SkillLevel.First/Next driven out here by a real caller. 53 tests.
